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        <title>树形菜单</title>
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        <h1>我的电脑文件列表</h1>
    <ul><li>我的电脑
    <ul type="circle"><li>本地磁盘(C:)<ul type="square">
    <li>我的文档</li>
            <li>我的收藏</li></ul>
        
        </li><li>本地磁盘(D:)
    <ul type="square">
    <li>我的游戏</li>
    <li>我的资料</li>
    <li>我的电影</li>
    </ul></li></ul></li></ul>
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